© Cornwall Autogas & MOT Centre

Crane Garage, Longdowns, Penryn , Cornwall

Running with "dual fuel"

The case for dual fuel vehicles.


In recent years the motor vehicle has become an indispensable part of our increasingly complex lives. Yet, as our reliance on the car has grown, so has the focus on the environmental impact motor vehicles have on our lives.


You may not realize it, but when your vehicle undergoes an LPG conversion, the existing petrol system is retained. The systems we fit will turn your vehicle into a "dual fuel" and "eco-friendly" means of transport. The extra flexibility achieved by having two choices of fuel gives you a fantastic range and proof against shortages of any one fuel.


LPG/petrol dual-fuel vehicles provide the option of running on cleaner burning liquefied petroleum gas, offering significant reductions in harmful exhaust emissions. LPG vehicles provide an immediate solution to improved air quality and lower levels of global warming gases. Meanwhile the motor industry continues to work on longer term and more fundamentally different vehicles to ensure future generations are able to benefit from the same freedom of vehicle ownership as this generation has enjoyed.


How dual fuel works.


Only specially designed "mono-fuel" vehicles are allowed to run on just LPG. Normally LPG vehicles are petrol engine cars and vans (and buses and trucks too) that have the gas system added. The Code of Practice governing the conversion of petrol engine vehicles specifies a design that provides safety cut-offs in the event of an accident. The LPG system is electrically (or, in later versions, electronically) controlled and the gas is switched on and off by two valves, one at the tank and one in the engine compartment. The engine must be running before the LPG system will allow gas to flow. That way, if the engine stops for any reason, the gas system is isolated. That means that you start the vehicle on "petrol" and the system changes to gas at a pre-set engine speed some moments later. Gas injection systems may have a temperature sensor that will keep the gas system "off-line" until the correct engine operating temperature is reached. Some of our systems make provision for starting on LPG in the event you have run out of petrol. The latest gas-injection system also has an automatic return to petrol when the gas supply is exhausted.